Thanks in large part to the information in this venerable thread (and a special hat tip to Mr. Webb, wherever he may be), I just bought a DR12-7 for a bit under $300, and I almost feel guilty of theft. Great tone, great volume & projection, no bridge lift or belly buckle. Stout as can be, and cosmetically 9/10+. I don't pose as an expert, but the back & sides are either (a) solid rosewood, or (b) a laminate with the external and visible internal grain perfectly matched; and I'm certain the top is solid sitka, judging from the visible soundhole grain. I've not removed the endpin for a closer check on the side wood, simply because I don't want to risk it. Personally I don't greatly care, but my tentative conclusion is that it's solid wood all around, & that jibes with what Mr. Webb and others have stated. There is some Sigma inconsistency, however: it has the original headstock logo, a zero fret, and an adjustable saddle, all (especially the zero fret) supposedly indicating a '70 - but the paper label seems to be the 2nd type and has a long serial number beginning with "74", indicating (again according to a Webb post) perhaps a '74. In any case, she's a hell of a 12-string in my book, and way ahead of the beater I was expecting to get for what I could spend.